使用ViewPager和ArrayList显示从Firebase获取的图像

Question

我正在尝试从ArrayList显示图像.ArrayList中的图像URL是从Firebase中检索的。我想在点击txt_btntamam时看到带有ViewPager的图像。我正在创建自己的SwipeAdapter类并且我检索了图像在Firebase的questActivity类中。 如果，如何使用ViewPager查看questActivity中的图像？

SwipeAdapter类

public class SwipeAdapter extends PagerAdapter {

private LayoutInflater layoutInflater;
private Context context;

public ArrayList<String> imgArrayList=new ArrayList<>();
public ImageView imgpage;

public SwipeAdapter(Context context){
    this.context=context;
    notifyDataSetChanged();
}

@Override
public int getCount() {
    return imgArrayList.size();
}

@Override
public boolean isViewFromObject(@NonNull View view, @NonNull Object object) {
    return view==object;
}

@NonNull
@Override
public Object instantiateItem(@NonNull ViewGroup container, int position) {

    layoutInflater= (LayoutInflater) context.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
    View itemView=layoutInflater.inflate(R.layout.page_fragment_layout,container,false);
    imgpage=itemView.findViewById(R.id.img_pageImgs);

    Picasso.get().load(imgArrayList.get(position)).into(imgpage);

    container.addView(itemView);
    return itemView;
}

@Override
public void destroyItem(@NonNull ViewGroup container, int position, @NonNull Object object) {
    container.removeView((View) object);
}
}

当我点击txt_btntamam时，我应该能够逐个看到arrayList中的图像。 的 questActivity.class

public class questActivity extends AppCompatActivity {

ViewPager viewPager;
SwipeAdapter swipeAdapter;

TextView txttamam;


@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_quest);

    init();
    bundleProcesses();

    swipeAdapter=new SwipeAdapter(this);
    viewPager.setAdapter(swipeAdapter);
    viewPager.beginFakeDrag();

    getImagesMethod();


    txttamam.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View v) {
            viewPager.setCurrentItem(getItem(+1),true);
        }
    });


}
private void getImagesMethod(){
    DatabaseReference ref= FirebaseDatabase.getInstance().getReference().child("level").child("1");
    ref.addListenerForSingleValueEvent(new ValueEventListener() {
        @Override
        public void onDataChange(@NonNull DataSnapshot dataSnapshot) {

            for(DataSnapshot snapshot : dataSnapshot.getChildren()){
                swipeAdapter.imgArrayList.add(String.valueOf(snapshot.getValue()));
                //Log.d("tag", String.valueOf(snapshot.getValue()));

            }
            Log.d("ArrayListSize", String.valueOf(swipeAdapter.imgArrayList.size()));
            swipeAdapter.notifyDataSetChanged();
        }

        @Override
        public void onCancelled(@NonNull DatabaseError databaseError) {

        }
    });
}


private int getItem(int i) {
    return viewPager.getCurrentItem() + i;
}

private void init(){
    viewPager=findViewById(R.id.viewPager);
    txttamam=findViewById(R.id.txt_btntamam);
}
private void bundleProcesses(){
    Bundle extras = getIntent().getExtras();
    int btnid = extras.getInt("sendLevelid");
    Toast.makeText(this,String.valueOf(btnid), Toast.LENGTH_SHORT).show();
}
}

感谢您的帮助。